Was It a Greeting From Another Planet?

Name: Was It a Greeting From Another Planet?
Genre: Documentary

The signal's proximity to the hydrogen line transforms an unexplained burst into one of humanity's most provocative questions.

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Transcript

For 72 seconds, the signal filled Big Ear's full observation window.
The Wow! signal has never recurred since August 15th, 1977.
The detection came August 15th, 1977, in an Ohio radio survey.
Ohio State's Radio Observatory recorded strong narrowband emission in 1977.
The room waits, amber-lit, around the silent equipment.
Signal sat near the 8.3-inch hydrogen line, or 21 centimeters.
A volunteer later found the anomaly in a computer printout.
The printout showed one sequence: 6EQUJ5, as intensity rose and fell.
Those characters encoded channel energy; they were not a message.
The burst was in one frequency channel, under 10 kilohertz wide.
As Earth turned, a fixed cosmic source should rise 36 seconds, then fall.
Its peak hit between 30 and 31 standard deviations above background noise.
Hydrogen was central to a 1959 ET radio-communication proposal.
The signal suggested intelligent life elsewhere in the universe.
But the evidence never established that the burst carried a message from anyone.
Follow-up searches ran nearly 14 hours over days, finding no similar emission.
In 1977, Ehman volunteered for SETI, the search for extraterrestrial intelligence.
He circled it, writing “Wow!” beside it.
The 2024 Arecibo study found weaker signals like the Wow! signal from neutral-hydrogen clouds.

In 2024, researchers proposed that the supposed greeting was actually a cold hydrogen cloud suddenly brightening.

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